Download and Installation

Arnold, KtoA, and other downloads are available here. Installation instructions come with KtoA, but can also be viewed here: Installation.


  • Arnold: 5.1.1+
  • Katana: 2.6v4+, 3.0v1+
  • Platforms:
    • Linux: x86-64, RHEL 6+ or compatible glibc
    • Windows: 7+ on x86-64, with VC++ 2015 redistributable installed


  • Update to Arnold The latest Arnold bugfix release is bundled, with some important bug fixes.

  • Optionally disable XGen multithreading: As a workaround for some occasional XGen issues, multithreading can be turned off in ArnoldXGen. This should only be done when necessary, as it has a performance impact. (#302)
  • EXR layer name override: Layer names in EXRs normally end up with the generic channels R,G,B,A, but using the EXR and deep EXR driver preserve_layer_name it will use the name of the AOV as set in ArnoldOutputChannelDefine. However, the layer name can now be further customized with layerName, when used in conjunction with preserve_layer_name. (#305)
  • Curve orientations attributes: Curve per-control-point orientation vectors can now also be specified with geometry.point.N and geometry.point.normal in addition to the geometry.point.orientation that was already supported. (#306)

Bug Fixes

  • #301 Don't use AiDevice API if optix denoiser is not enabled

  • #302 Allow disabling of xgen multithreading

  • #303 All curves get the same curveWidthStart and curveWidthEnd


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